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Replace the fingerprint enrollment APNGs on the webauthn fingerprint
enrollment page by lottie versions. This shaves ~200kb and adds a
transparent background to the fingerprint animation that partially fixes
issue 1041877.

Also, add "hidden" and "singleLoop" attributes to lottie to match the
APNG img tag behaviour; and update the wrapper to allow dynamically
loading another animation into the same element.

Finally, this updates the settings UI worker CSP to allow the lottie
worker.

Fixed: 1082312
Change-Id: I0c92663ec6e1bfd76c03f995b6e96d210f26173f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2116557
Commit-Queue: Nina Satragno <nsatragno@chromium.org>
Reviewed-by: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786933}